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The C-Band All-Sky Survey (C-BASS): Total intensity point source detection over the northern sky | | R. D. P. Grumitt
; Angela C. Taylor
; Luke Jew
; Michael E. Jones
; C. Dickinson
; A. Barr
; R. Cepeda-Arroita
; H. C. Chiang
; S. E. Harper
; H. M. Heilgendorff
; J. L. Jonas
; J. P. Leahy
; J. Leech
; T. J. Pearson
; M. W. Peel
; A. C. S. Readhead
; J. Sievers
; | | Date: |
18 Oct 2019 | | Abstract: | We present a point source detection algorithm that employs the second order
Spherical Mexican Hat Wavelet filter (SMHW2), and use it on C-BASS northern
intensity data to produce a catalogue of point sources. The SMHW2 allows us to
filter the entire sky at once, avoiding complications from edge effects arising
when filtering small sky patches. The algorithm is validated against a set of
Monte Carlo simulations, consisting of diffuse emission, instrumental noise,
and various point source populations. The simulated source populations are
successfully recovered. The SMHW2 detection algorithm is used to produce a
$4.76,mathrm{GHz}$ northern sky source catalogue in total intensity,
containing 1729 sources and covering declinations $deltageq-10^{circ}$. The
C-BASS catalogue is matched with the GB6 and PMN catalogues over their common
declinations. From this we estimate the $90\%$ completeness level to be
approximately $630,mathrm{mJy}$, with a corresponding reliability of $95\%$,
when applying a Galactic mask covering $20\%$ of the sky. We find the C-BASS
and GB6/PMN flux density scales to be consistent with one another to within
$3\%$. The absolute positional offsets of C-BASS sources from matched GB6/PMN
sources peak at approximately $3.5,mathrm{arcmin}$. | | Source: | arXiv, 1910.8583 | | Services: | Forum | Review | PDF | Favorites | |
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